Lubricating crank-pin.



O. [1. NORTH.

LUBRICATING CRANK PIN. APPLICATION man SEPT- 24.191 1 Patented Aug, 6,

UNITED STATES ann r n OLIVER, DANSON Noam, 01? LONDON,- ENGLAND,ASSIG1\TOR T STRAKERQSQUIJRE LIMITED, or LONDON, ENGLAND. 1 r I LUBRICATING CRANK-PIN.

To all whom it may concern:

Be it known that I, OLIVER FDANSON N ORTH, a subject of the King of Great Britain, residing in London, England, have invented certain new and useful Improvements in Lubricating Crank-Pins, of which the following "is' a specification;

This invention relates to apparatus for lubricating crank pins comprising a scoop fixed to the end of the-crank pin and means for introducing lubricant into the path of the scoop;-the "latter receives the lubricant which passes through the scoop into a passage in the crank pin, such as is frequently provided for lubrication.

When'applied to an internal combustion engine, the apparatus presents advantages as compared with those in which oil is're ceived in an annular gutter coaxial with the crank pin, notably in being applicable to a multiple-crank engine; In its application, however,- there are certain difficulties arising from the necessity of insuring that the scoop shall receive the oil'when the engine is running at high speed. Those diiiiculties are mainly th'at unless the scoop is properly shaped'it is apt to deflect the 'oil so that the latter is not received on the receiving sur- I f bf the scoop, and that a like result ensues owing to the'current of'airwhich is setup" bythe rapidly moving crank and scoop and scatters theoil; g I

The accompanying drawings j illustrate the invention, Figure 1- being a side elevation partly in longitudinal section of'part of a hollow cam shaft-serving as' an oil' distributer to'the crank casing of a four-cylinder internal combustion engine; in the lower 1 part of the figure is shown in elevation one 40 of'thecrank pins with its receiving scoop and in Fig. l th-is crank pin is shown turned through an angle of 90 as compared with Fig. 1. Fig. -2is an end elevation of Fig.

1 and Fig. 3 is a cross section through a part of the crank casing, drawn to' a reduced scale. s 1' The crank pina 'is forinedwith a fiat steppedface b at one end,',to whichfacfe'is fitted acorrespondingly shaped face of the scoopfci the latter being'fixed' in place by screws or otherwise; The scoop travels in a circle having'its center in the axis d' (Fig. 3) of the crank shaft and is of such shape that'its cross section is a portion of a seg- Specification of Letters Patent. 7

ment of this circle. Thus the scoop has an outer surface concentric with the axis of, the crank pin and an inner fiat face 0. It'isim- PatentedAug. 6, 1918. Application filed September 24, 1917. Serial No. 192,945.

material whether the crossvsection is a whole segment or any particular fraction of a segment, but the edge of the scoop whichis forward in the direction of travel is indicated by the arrow in Fig. 3, should be formed by the meeting ofthe cylindrical andfla t faces.

In the flat face 6 is a cavity f in which opens a bore f registering with' a'bore a in the crank pm. j In Fig. 3 the scoop c is about to receive a'drop of oil on the face a, which will find 'lts wayinto cavity f'and thence, owing to centrifugal force, through the passages f, a to the surface of the crank pin.

'' In order to avoid thedisturbing effect of the current of air caused by the rotary moveof the shaft convey the oil to the bearing surfaces whence itflows into the tubeiform ment, a screen orv bafiie', or' as. here shown ing a bath in which the cams are more or less'i'mmersed. I 7 According to this invention,'such a system oflubrication iscOmbined-withthe new apparatus for lubricating crank pins, by boring the wall of the tunnel or tube at the v s bearing of the shaftand 'fittingin the bore ajpipe throughwhich oil passes to the path of the aforesaid scoop, that is to say, injthe most general case,"the pipe extends into the crank case of'the engine. In the drawings thehollow cam having journals Ia rotates in a" tube Z. In each of as many journals as may be required there isfa radial bore m and as the shaft rotates this bore registers, with a pipe shaft '5 71. s'crewed into aQb'orein the wall of the tube Z and extending through the wall 0 of the crank case. I As shown, the pipe 'n, is horizontal and. terminatesin 'a jet 72 extending nearly into the path of scoop '0.

" The oil pump shown consists of a plunger metrica-l'bore of aadisk-sadapt'edto oscillate in a casing t having ports t, t so's'ituat'ed that as disk 8 oscillates in accord with the oscillatory movement of plunger 9 its cy lindrical bore registers with port t at one end of the oscillatory stroke and" with portt at the other end. Port t is connected by pipe to with the lower part of the crank case, while port I? communicates through passage o with a chamber to formed by the cover m which closes the end of tube Z. The cylindrical bore of disk .9 .registers with port t when plunger 9- is making an upstroke and with port 25 when plunger 9 is making a downstrokeythus oil is pumpedinto chamber 10 whence it findsits way through perforation y in the'disk r intothe axial bore ofshaftz'. I v I i It being preferable that at-the moment when a radial bore mac-registers with pipe 11. the full*-pressure head under which the oil exists in the hollow shaftZ should beavailable for ejecting oil, the several bores m in the several journals is of the shaft 71 are angularly displaced relatively to each other around the axis of the shaft, so that notwo bores m register with their corresponding pipes n at the same time. c 1 The oil should preferably drop uniformly into the path of the scoop and to this end the jet p is radially bored as at a, so that the pressure on the oilis relieved and the flow is determined by gravity alone. 7

In the case illustrated. the tube Z is a casting in one piece with the guides Z for the cam rods z" operated by the cams i Having thus described the nature of the said invention and the best meanslknow of carrying the same into practical. effect, I claim:-

1. Apparatus for lubricating crank pins comprising a scoop fixed to the-end of the crank pin, a passage from the scoop to the bearing surface of the crank pin, and means for introducing lubricant into the path of the scoop.

2: Apparatus for lubricating crank'pins comprising a scoop having an outer surface concentric with the axisof'the crank pin and an inner flat face fixed to the end of the crank pin, and means for introducing lubricant into the path of the scoop.

3. Apparatus for lubricating crank pins comprising a scoop having anouter surface concentric with the; axis of. the crank pin and an inner flat face fi-xedto the end of the crank pin, a passage from the scoop to the bearing surface of the crank pin, and means for introducing lubricant into the path of the Scoop.

4;. Appar tus for lubricating crank pins comprlsing a scoop fixed to. the end ofthe crank pin, a passagefrom the scoop to the bearing surface of the'cr'ank pin; means for introducing lubricant into the path of the scoop andla screen 2 extending nearly into the path of the scoop so as to shelter the lubricant.

5L-A-pparatus for lubricating crank pins comprising a scoop having an outer surface concentric" with the axis of the prankm and an inner flat face fixed to the end of the crank pin, a passage from the scoop to the bearing surface of the crank ,pin,-nieanjs for introducing lubricant into the path of the scoop; and a screen-extending nearly into the path of the scoop so asto shelter the lubricant.

6. Apparatus forlubricatingi crankpins 7 case, a screen attached to the crank case and extending nearly into the pat-hoof the scoop so as to shelter the l 'lbricantand means for introducing.lubricant intoa'the path of the scoop.

7. Apparatus for comprising a scoop fixed'to the endof: the crank pin, a ,passagefrom the scoop to the bearing surface of the crank pin, ajet extendingnearly into the path of ;the-scoop',qa hollow cam shaft,=journals on the said shaft, a tube, bearing surfacesinthe said tube for the said journals, a-passage connecting the said jets with one; of the said surfaces,- a radial passage in the j ourn'al turningin the said surface, and means for feeding? oil; under pressure to the said hollow :cam shaftn,

8. Apparatus for lubricatingjthei crank .pins of multiple cra-nk engines,-- comprising a-scoop fixed to the end of each-crank pin,

lubricating crank pins a passage from the-scoopto the'bearing surface of the crank pin, :ajet'extendingnearl'y into the path of each scoop, ahol-low-cam shaft, journals on the sa-id, .shaft,: autube, bearing surfaces in.the said-tube-for the said journals, apassage connecting. each .jet

with a separate said bearing surfacea rad-i'al passage in eachofthe said journals", and means for feeding- ;oil under: pressure to the saidhollow cam shaft,-;the .saidradial passages "being angularly 'displaced rela'- 1 tively to each other a-ro-und the axis of the cam shaft. A e

9". Apparatus for lubricating-crank pins comprising a hollow cam shaft, a journal thereon, a tubewithin which thesaidshaift rotates, a bearing surface in the said tubeifor the said journal,- aradial, bore in the s 'aid journal, a passage throughthe: wall. of the said tube in position for the-said radial bore to register with it, a pipe continui-ng the pin, a jet extending from the said pipe In testimony whereof I have signed my nearly into the path of the said scoop, radial name to this specification in the presence of perforations in the said jet, a screen attwo subscribing witnesses.

tached to the crank case and extending close OLIVER DANSON NORTH. 5 to the said jet and nearly into the said path, Witnesses:

and means for feedin oil under pressure to C. S. HOPKINS,

the said hollow cam s aft. 7 W. I. SKERTEN.

Copies of this patent may be obtained for five cents each, by eddies/slug the commissioner of Patents. Wellington, 1). 0." 

